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Highly Efficient Near Infrared Photothermal Conversion Properties of Reduced Tungsten Oxide/Polyurethane Nanocomposites
- Source :
- Nanomaterials, Vol 7, Iss 7, p 191 (2017), Nanomaterials, Nanomaterials; Volume 7; Issue 7; Pages: 191
- Publication Year :
- 2017
- Publisher :
- MDPI AG, 2017.
-
Abstract
- In this work, novel WO3-x/polyurethane (PU) nanocomposites were prepared by ball milling followed by stirring using a planetary mixer/de-aerator. The effects of phase transformation (WO3 → WO2.8 → WO2.72) and different weight fractions of tungsten oxide on the optical performance, photothermal conversion, and thermal properties of the prepared nanocomposites were examined. It was found that the nanocomposites exhibited strong photoabsorption in the entire near-infrared (NIR) region of 780–2500 nm and excellent photothermal conversion properties. This is because the particle size of WO3-x was greatly reduced by ball milling and they were well-dispersed in the polyurethane matrix. The higher concentration of oxygen vacancies in WO3-x contribute to the efficient absorption of NIR light and its conversion into thermal energy. In particular, WO2.72/PU nanocomposites showed strong NIR light absorption of ca. 92%, high photothermal conversion, and better thermal conductivity and absorptivity than other WO3/PU nanocomposites. Furthermore, when the nanocomposite with 7 wt % concentration of WO2.72 nanoparticles was irradiated with infrared light, the temperature of the nanocomposite increased rapidly and stabilized at 120 °C after 5 min. This temperature is 52 °C higher than that achieved by pure PU. These nanocomposites are suitable functional materials for solar collectors, smart coatings, and energy-saving applications.
- Subjects :
- Materials science
General Chemical Engineering
Nanoparticle
nanocomposites
tungsten trioxide
photothermal conversion
polyurethane
near infrared ray
02 engineering and technology
010402 general chemistry
01 natural sciences
Article
lcsh:Chemistry
chemistry.chemical_compound
General Materials Science
Composite material
Absorption (electromagnetic radiation)
Ball mill
Polyurethane
Nanocomposite
Molar absorptivity
021001 nanoscience & nanotechnology
Tungsten trioxide
0104 chemical sciences
lcsh:QD1-999
Chemical engineering
chemistry
Particle size
0210 nano-technology
Subjects
Details
- ISSN :
- 20794991
- Volume :
- 7
- Database :
- OpenAIRE
- Journal :
- Nanomaterials
- Accession number :
- edsair.doi.dedup.....a72dd104fe777dad82b66237c3ea7460